Pulp or paper machine.



No. 891,985. PATENTED JUNE 30, 1908.

G. M. GALT.

PULP 0R PAPER-MACHINE.

APPLICATION FILED MAY 16v 1908.

' Q fiiu iliiwh I INVENTCIR: M I IN i NIH;

PHOTQ-LIYHO by sacxzrra wlmzuas comma I By ANN/influx, I I

H To a'l l who m it may concern:

UNITED srarns r rnivr OFFICE.

fnoqaanossl I h M.GALT, reslding nlvlalden, county of Middlesex, and stamp! Massachusetts, subject iof the King met known tha I, GEORGE of GreatlBritain, haveinvented certain new and useful Ifhprovements in Pulp or Paper Machines, of which the following is a specifieatio nfj I The invention aims to )rovide an improvedfinachinefor use in t e manufacture of wetlpulp orpa er whereby the stock before lea'ving thefe t is subjected to pressure, the first a gentle 'ressure which s ueezes outalargte part oft s water and enab esthe stock to etter' -staiui the second which is a heav -,.pre'ssuref Th'e hydraulic'pressure to "whi lithe stockis usually submitted makes holsii thef'eltb y reason of the lumpiness of the speaker-paste, These'felts are very expensive rid wear'out very soon with the ordinary ni achines.' By the first gentle press ureiof" the resent ma'chine,the paste is '-smo'othed wit out seriously injuring the ffeltsiandjpassestofithe point of the second- 25 pressure in a comparatively uniform and dry condition the} -h)r drs uulic pressure can ;;act upon itmo're'efiiciently in this condition. 'Preferabg fthree rolls :are employed to secure the e'sired pressures, thestock' being pressed twice in passing around the middle rolld Separate pairs of rolls for the two different pressures may beused and any additional number of pressures may be a lied. The important feature is to have a yie ding pressure such as is obtained'from springs, weights, or pneumatic devices or even a lighter hydraulic pressure, followed later by the usual heavy hydraulic pressure.

The accompanying drawings illustrate more or, less diagrammatically a machine embodying the invention for use in the manufacture of box board.

Figure 1 is a side elevation, and Figs. 2,

3 and 4 are sectional views of details on any O, the long end of which is connected to a enlarged scale.

For the making of box board it is roposed r Specification of Letters Patent.

Application filed May 16,1906. Serial No. 317,191.

..1; i 1 GEORGE M.-GALT, MALDEN, MASSACHUSETTS.

' PULP on PAPER MACHINE.

Patented June-30,1908.

adapted to various other uses in connection with paper making. It is particularly useful as a-wet pulp machine for forming the pulpinto sheets;

In the embodiment of the invention illustrated the ressure machine is shown in connection wit 1 a drum A of any usual or suitable material, the stool; being taken from the drum by a felt B running over a couch roll C and over a suitable suction device if desired, The pressuremaohine is shown as containing three rolls D, E and F arranged in the same vertical plane, the lower roll F being stationary and the other two vertically movable. The felt B-runs over the first roll D and then between the two rolls D andE, around the back of the roll E and the front of the roll F and thence returns to the couch roll. .It is given first a comparatively slightand preferably yieldingpressure between the rolls D and E and then the'usual heavy'hydraulic rigid pressure between the rolls E and F. These pressures/may be applied by a great variety of devices' The form shown-is a yerysnnple one consisting of springs G pressed downward on the bearing blocks ll of the upper roll D, these bearing blocks being arranged toslide vertically upon the front portion of the frame J Preferably a shaft K is provided havinga collar bearing on the upper end of the spring G, the shaft being ada ted to screw through a suitable portion of t e frame J so as to increase or decrease the spring pressure on the bearingblocks II and so as to adjust the opposite ends .of' the roll relatively to each other.

The roll E is capable of a vertical movement. This is so slight as not to interfere with the proper operation of the yielding pressure roll D. The bearing blocks L for this roll are mounted on trunnions M on the frame J of the machine and are pivoted at their upper ends to links N of adjustable length connected to the short end of the lever subjected to the pressure between the two lower rolls and issues in a continuous strip R. Where box board is to be made of two sheets then two machines may be arranged to face each other as shown and the strips R and R issuing from the respective machines are brought together and pressed between rolls S and T (which are preferably arranged one above the other to economize space). Probably the'strips R R will be sufficiently wet to' adhere to each other. If not a paste a plying device U may be arranged to a p y paste to'the inner face of .either one o the strips. A considerable difiiculty usually encountered in the making of this product is the presence of felt marks on the face of the v I -were in contact ranged to receive the'water which is squeezed -finished product due to the roughness of the felt and the pressure of the individual strips betweenthe felt on one face and the roll on' the other face.

By the arrangement shown the faces of the two strips R and R which with the felt are brought together'on the inside so that the ex osed faces of' the finished product will be t ose which traveled against the roll E and which were at no time in contact with the felt.

In order to carry away the water a is preferably rovided in the front angle between the ro ls' D and This doctor is preferably in the shape of a trough V arout of the pulp at this point and to carry it away through a pipe W connected to the'suction pump.

By the arrangement of the rolls one above the other as shown, the pressure between the *two lower rolls is not onlythat due to the r 7. Though I have describe with great parhydraulic pressure, but is increased by the weight of the roll E and also by the weight of the roll D and the pressure of the sprlng G, these last two being yieldin pressures.

doctor intermediate roll ticularity of detail the specific embodiments of my invention, yet it is not to be under-' stood therefrom that the invention is limited to the particular embodiments disclosed. Various modifications thereof detail and in the combination of the parts may be made.

by those skilled inthe'art without departure from the mvention.

In some cases instead of using hydraulic pressure between the second and the lowest "rolls E-and F, I may same as for the first two rolls. 7 the machine is designedto' use either or both,

use spring pressure the Preferably and the spring-pressure isdesigned to be adjustable. For example the piston rod X maybe provided with an extension Y projecting through the opposite end of the cylinder, and carryinga nut Z which forms an adjustable collar to receive the upward pressure of a spring a.

What I claim is g In .a pulp or' paper machine-or the like, a pressure apparatus for pressing the water out ofthe stock'and comprising in combination three rolls arranged in the same plane the lowest roll E beingrigidly mounted, pivoted bearing blocks L carrying the second roll, a hydraulic apparatus connected to saidbearing blocks L to press thelowest and the H for pressure, and sliding bearing blocks the uppermost roll and springs G engaging said bearing blocks H to press the upper two rolls together with a yieldin pressure.

together with a hydraulic "In witness whereof, I have ereunto signed my name in the presence of two subscribing witnesses. I

v GEORGE M. GALT. Witnesses: p Y

DOMINGO A.UsINA,

"THEODORE T. SNEL -Q 

